Conway's book has about 4 pages directly comparing Java & Perl. He does a short stint on each of Objects, Classes, Methods, Constructors and finalizers, Encapsulation, Inheritance, Polymorphism, and Exception Handling. There's then a page ana bit table of comparative syntax.

not sure if it's worth buying the book just for that, but since the rest of the book stands up on it's own, it'd be a bargain! 8)

cheers,

J